49.限制汽车的数量

limit the number of cars

48.来自发展中国家的人

　 people from developing countries

47.当地政府决定迁移工厂 the local government decided to move the factories

46.住院　 be in hospital

45.做重要的讲话

　make a very important speech

44.学会与大自然和平共处

　learn to live in harmony with nature

43.对于全球变暖了解不多

　not know much about global warming

42.表示愿意来帮忙

show great willingness to come and help

41.采取行动拯救地球

take action to save the earth

40.得出结论　 draw a conclusion